RT Book, Section
A1 Zafren, Ken
A1 Thurman, R. Jason
A1 Jones, Ian D.
A2 Knoop, Kevin J.
A2 Stack, Lawrence B.
A2 Storrow, Alan B.
A2 Thurman, R. Jason
SR Print(0)
ID 1181050796
T1 High-Altitude Retinal Hemorrhage
T2 The Atlas of Emergency Medicine, 5e
YR 2021
FD 2021
PB McGraw-Hill
PP New York, NY
SN 9781260134940
LK accessemergencymedicine.mhmedical.com/content.aspx?aid=1181050796
RD 2024/04/25
AB Retinal  hemorrhages  are  common  above  5200  m  (17,000  ft)  and  are  not  usually  associated  with  acute  mountain  sickness  (AMS).  High-altitude  retinal  hemorrhages  (HARHs)  are  rarely  symptomatic,  but  if  found  over  the  macula,  these  hemorrhages  may  cause  temporary  blindness.  The  diagnosis  can  be  established  by  ophthalmoscopy.  Without  visualization  of  the  lesion,  the  differential  diagnosis  of  unilaterally  decreased  vision  or  blindness  at  high  altitude  includes  migraine  equivalent,  cerebrovascular  accident,  and  dry  eye  (often  unilateral,  due  to  strong  winds),  as  well  as  all  conditions  found  at  sea  level.